JP5977067B2 - Sealing structure of power distribution equipment - Google Patents

Description

  The present invention relates to a sealing structure of a power distribution device that leaves an open trace when a covered cover is opened.

  Conventionally, the seal structure of this type of power distribution device varies in type and form depending on the customer who purchases the power distribution device. Currently, three types of sealing structures are mainly used. First, a sealing cap type sealing structure in which a square or round sealing cap is fitted into a groove formed in the head of a sealing screw to perform sealing. There is. Secondly, there is a wire-type sealing structure in which a through-hole formed in the head of the sealing screw and a hole provided in the cover are annularly formed through a wire and the knot is sealed with lead or the like. Third, there is a seal-type sealing structure in which characters appear when the seal is peeled off.

  As the sealing structure of the first and second power distribution devices using a sealing screw that is a special screw, for example, the sealing structure of a watt hour meter disclosed in the prior art of Patent Document 1 is generally widely known. ing.

  In this sealing structure, in the watt-hour meter 1 as shown in FIG. 1, the cover 2 and the base 3 are sealed with screws 4 on both sides thereof, and the terminal cover 5 and the base 3 are sealed on both sides of the terminal cover 5 with sealing screws 6. Then conclude. Then, sealing is performed by covering each head of the sealing screws 4 and 6 with a sealing cap (not shown). Alternatively, a wire (not shown) is passed through a hole 5 a provided in the terminal cover 5 and a through hole formed in the head of the sealing screw 6, and sealing is also performed by fixing the annular knot with lead or the like. The Since the seal cannot be released unless the sealing cap is broken or the wire is cut or lead is broken, the trace remains when the covered cover 2 or the terminal cover 5 is opened.

JP 2004-245704 A

  However, in the conventional power distribution device, in any of the sealing cap type, wire type, and seal type sealing structures, the cover and the terminal cover are fixed to the base using two or more sealing screws. In the sealing cap type sealing structure, the sealing screw is covered with a sealing cap for sealing. In the wire sealing structure, the sealing screw is sealed through a wire. Further, in the seal-type sealing structure, a seal is applied between the cover fixed with the sealing screw or the terminal cover and the base for sealing. For this reason, conventionally, in any sealing structure, it takes time and labor to fasten the sealing screw. In addition, the number of expensive sealing screws, which are special screws, increased, leading to an increase in the product cost of power distribution equipment.

The present invention has been made to solve such problems,
In the sealing structure of power distribution equipment that leaves an open trace when the covered cover is opened,
The cover is slid to fit into the base of the power distribution equipment,
It has a fitting maintenance structure that keeps the cover fitted to the base and seals it ,
The fitting maintenance structure has a sealing screw mounting portion for attaching a sealing screw formed on the base, and a sealing cap that exposes the sealing screw attached to the sealing screw mounting portion when the cover slides into the base. A cutout portion formed on the cover, having a cutout shape that fits and a side wall that interferes with the fitted seal cap, and is covered with the head of the seal screw screwed into the seal screw mounting portion The sealing cap fitted into the cover interferes with the side wall to prevent the cover from sliding .

According to this configuration, sealing is performed by sliding the cover so that the cover is fitted to the base of the power distribution device, and this fitting state is maintained by the fitting maintaining structure. For this reason, it is possible to provide a seal by providing a fitting maintaining structure in at least one location of the power distribution device housing and simply preventing the cover from sliding. Therefore, it becomes possible to fix and seal the cover to the base without using the sealing screw used in the sealing structure of the conventional power distribution equipment, reducing the labor and time required for fastening the sealing screw, Workability can be improved. In addition, the number of expensive sealing screws used can be reduced and the number of parts can be reduced, and the product cost of the power distribution equipment can be suppressed.

According to this configuration, the sealing screw is screwed onto the base and the sealing cap is put on the head of the sealing screw, so that the sealing cap interferes with the cover fitted to the base, and the sliding of the cover is prevented. And sealed. For this reason, once the sealing screw is attached to the base , the cover can be opened and closed by simply attaching and removing the sealing cap to the head of the sealing screw without turning the sealing screw. . Therefore, once the sealing screw is attached to the base , the sealing screw is not required to be tightened thereafter, and the workability is greatly improved.

Further, according to the present invention, the fitting maintaining structure coincides with the hole provided in the wall surface of the base that penetrates the pilot hole that forms the sealing screw mounting portion, and the position of the hole when the cover is fitted to the base. The structure is characterized in that the cover is prevented from sliding through a string-like body through a hole provided in the cover.

According to this configuration, the cover can be easily sealed by simply sliding the cover into the base , aligning the positions of the holes provided in the cover and the base , and passing the string-like body through the holes. Is done.

  According to the present invention, it is possible to reduce the labor and time required for the fastening operation of the sealing screw, improve workability, reduce the number of expensive sealing screws used, and suppress the product cost of power distribution equipment. A power distribution device sealing structure is provided.

It is a disassembled perspective view of the watt-hour meter to which the sealing structure of the conventional power distribution apparatus is applied. It is a perspective view of the cover and base of the watt-hour meter to which the sealing structure of the power distribution apparatus by one embodiment of this invention is applied. It is a top view of the terminal part right side part of the base shown in FIG. 2 before and after a cover slides. It is a perspective view explaining the aspect by which the cover and base of the watt-hour meter shown in FIG. 2 are sealed using a sealing screw and a sealing cap. It is the perspective view and partial sectional view explaining the aspect by which the cover and base of the watt-hour meter shown in FIG. 2 are sealed using a wire and lead. It is a top view of the terminal part right side part of the base before and behind the cover sliding in the modification of one Embodiment. It is a perspective view of the cover and base of an electric energy meter in other modifications of one embodiment.

  Next, an embodiment in which the sealing structure of a power distribution device according to the present invention is applied to the sealing structure of a watt-hour meter will be described.

  FIG. 2 is a perspective view of the cover 11 and the base 12 of the watt hour meter used in the sealing structure of the watt hour meter according to the present embodiment.

  The cover 11 and the base 12 are resin-molded and constitute a casing of an watt hour meter that is a power distribution device. The cover 11 is covered with the base 12 and is slid toward the electric wire insertion opening 12 b of the base 12, so that the edge 11 a of the cover 11 is fitted to the edge 12 a of the base 12. This fitting structure of the cover 11 and the base 12 is a structure in which the fitting cannot be released unless the cover 11 is slid to the side opposite to the wire insertion port 12b.

  A sealing screw mounting portion 12 c is formed on the right side of the terminal portion of the base 12. The seal screw mounting portion 12c has a structure in which only a seal screw pilot hole that can be self-tapped is provided, or a structure in which nuts such as an insert nut are embedded, or a structure in which a female screw is directly cut into the seal screw pilot hole. Consists of. When the cover 11 is put on the base 12, the sealing screw mounting portion 12 c is exposed to the notch portion 11 b of the cover 11. The sealing screw 13 attached to the sealing screw attaching part 12c is also exposed to the notch part 11b of the cover 11 as shown in the terminal part right side plan view of the base 12 shown in FIG. FIG. 6A shows a state before the cover 11 shown with hatching is put on the base 12 and slid. The cutout portion 11b has a rectangular sealing cap 14 fitted therein as shown in FIG. 5B in the state after the cover 11 is slid over the base 12, and as shown in FIG. It has a notch shape in which a round sealing cap 15 is fitted. Further, the notch portion 11b includes a side wall 11b1 that interferes with the square sealing cap 14 fitted as shown in FIG. 5B, and a round sealing cap 15 fitted as shown in FIG. The side wall 11b2 which interferes with is provided.

  Further, a hole 11d is opened in the left side wall of the terminal portion of the cover 11 as shown in FIG. In addition, a hole 12d having an inverted L-shaped cross section is formed on the left side of the terminal portion of the base 12 and opens in the left side wall surface of the terminal portion and the upper surface of the terminal portion. When the cover 11 is put on the base 12 and is slid, and the cover 11 and the base 12 are fitted, the hole 11d of the cover 11 and the hole 12d of the base 12 coincide with each other. In this embodiment, the holes 11d and 12d are provided on the left side of the terminal portion of the housing. However, the positions are not limited to this, and can be provided at arbitrary positions.

  The sealing structure of the watt-hour meter of the present embodiment is such that the sealing cap 14 or 15 that covers the head of the sealing screw 13 that is screwed to the base 12 interferes with the cover 11 that is fitted to the base 12. The cover 11 is provided with a fitting maintaining structure that prevents the cover 11 from sliding and maintains the state in which the cover 11 is fitted to the base 12 for sealing.

  In this sealing structure, first, as shown in FIG. 4A, the cover 11 is slid to the side of the electric wire insertion port 12b indicated by the arrow and fitted to the base 12, and the sealing screw 13 is attached to the sealing screw mounting portion 12c of the base 12. Screwed on. As shown in FIG. 3B, the head of the sealing screw 13 is covered with a sealing cap 14 or 15, and the sealing cap 14 or 15 is placed on the side wall 11b1 or 11b2 provided on the cover 11 as shown in FIG. Or, as shown in (c), the watt hour meter is sealed by interfering and preventing the cover 11 from sliding. 4 that are the same as those in FIGS. 2 and 3 are given the same reference numerals, and descriptions thereof are omitted.

  To open the cover 11, the cap 14 or 15 is broken to eliminate the interference between the side wall 11b1 or 11b2 and the sealing cap 14 or 15, and the cover 11 is slid in the direction opposite to the wire insertion opening 12b. It is necessary to move to the position shown in 3 (a). Therefore, when the cover 11 covered with the base 12 is opened, the sealing cap 14 or 15 is broken, and a trace of the opening of the cover 11 remains.

  In the sealing structure of the watt-hour meter of the present embodiment, the above-mentioned fitting maintaining structure is provided in at least one place of the casing of the watt-hour meter, and sealing can be performed by simply preventing the cover 11 from sliding. Become. Accordingly, the cover 11 can be fixed and sealed to the base 12 without using the sealing screw 4 used in the sealing structure of the conventional watt-hour meter shown in FIG. This makes it possible to reduce work and time and improve workability. In addition, the number of expensive sealing screws 13 used can be reduced and the number of parts can be reduced, and the product cost of the watt-hour meter can be suppressed.

  In the sealing structure of the watt-hour meter according to the present embodiment, once the sealing screw 13 is attached to the base 12, the sealing cap 14 or 15 is attached to or detached from the head of the sealing screw 13 without turning the sealing screw 13 thereafter. By simply doing, the cover 11 can be opened and closed, and sealing and unsealing can be performed. Accordingly, once the sealing screw 13 is once attached to the base 12, the work for fastening the sealing screw 13 is no longer necessary, and the workability is greatly improved.

  Further, in the sealing structure of the watt-hour meter of the present embodiment, the wire 16 is connected to the holes 11d and 12d respectively provided in the cover 11 and the base 12 as shown in the perspective view of FIG. And a fitting maintaining structure that prevents the cover 11 from sliding and maintains the state in which the cover 11 is fitted to the base 12 for sealing. FIG. 2B is a cross-sectional view of the casing through which the wire 16 is passed. In the figure, the same parts as those in FIG.

  In this sealing structure, first, the cover 11 is slid and fitted into the base 12 so that the positions of the holes 11d and 12d provided in the cover 11 and the base 12 are matched. Then, the wire 16 is passed through the holes 11d, 12d, and the annular knot is simply fixed with the lead 17, so that the sealing is easily performed. Since the seal cannot be released unless the wire 16 is cut or the lead 17 is broken, the trace remains when the cover 11 covered with the base 12 is opened.

  Even with this sealing structure, it is possible to provide sealing by providing the above-described fitting maintaining structure at least at one location of the watt-hour housing and simply preventing the cover 11 from sliding. Therefore, even with this sealing structure, the labor and time required for the fastening operation of the sealing screw 4 can be reduced and workability can be improved. In addition, the number of expensive sealing screws 13 used can be reduced and the number of parts can be reduced, and the product cost of the watt-hour meter can be suppressed.

  In the above-described embodiment, the watt hour meter is configured to have both a sealing structure in which the head of the sealing screw 13 is covered with the sealing cap 14 or 15 and a sealing structure in which the wire 16 is passed through the holes 11d and 12d. Explained. However, the watt-hour meter is provided with either one of the sealing structures, so that the same effect as that of the above-described embodiment is achieved.

  Moreover, in said embodiment, about the case where the notch part 11b of the cover 11 has the notch shape shown in FIG. 3 in which both the square sealing cap 14 and the round sealing cap 15 fit. explained. However, the cover 11 may include a cutout portion 11e having the cutout shape shown in FIG. 6A, and only the square sealing cap 14 may be fitted as shown in FIG. In this configuration, the sealing cap 14 interferes with the side wall 11e1 of the notch 11e, thereby preventing the cover 11 from sliding and sealing. Further, the cover 11 may be provided with a notch portion 11f having a notch shape shown in FIG. 10C, and only the round sealing cap 15 may be fitted as shown in FIG. In this configuration, the sealing cap 15 interferes with the side wall 11f1 of the notch portion 11f, thereby preventing the cover 11 from sliding and sealing. 6 that are the same as or correspond to those in FIG. 3 are assigned the same reference numerals, and descriptions thereof are omitted.

  In the above embodiment, the case where the hole 12d through which the wire 16 is passed through the base 12 is provided exclusively for wire-type sealing as shown in FIGS. 2 and 5 has been described. However, as shown in FIG. 7, the sealing screw mounting portion 12c is a prepared hole of the sealing screw 13, and a hole 12e penetrating from the side surface to the prepared hole is provided on the right wall surface of the terminal portion of the base 12. You may make it form the hole which opens to a right side wall surface, and the cross section was L-shaped. Also when the cover 11 is slid with the cover 12 covered by the base 12 and the cover 11 and the base 12 are fitted, the positions thereof coincide with the holes 11g provided in the cover 11. Therefore, sealing can be performed by passing the wire 16 through these holes and fixing the annular knot with lead 17 or the like. The sealing can also be performed by attaching the sealing screw 13 to the sealing screw mounting portion 12 c without using the wire 16 and covering the head of the sealing screw 13 with the sealing cap 14 or 15.

  In the above embodiment, the case where the cover 11 has a structure that integrally covers both the device main body and the terminal portion has been described. However, like the watt-hour meter 1 shown in FIG. 1, the cover 11 is separated into a cover 2 portion covering the device main body and a terminal cover 5 portion covering the terminal portion, and each separated portion is attached to the base 12. A structure that slides and fits may be provided. Also in this configuration, the same effects as those of the above-described embodiment can be achieved by maintaining and sealing the fitting state of each part by the above-described fitting maintaining structure.

  In the above embodiment, the case where the power distribution device is a watt hour meter has been described, but the sealing structure of the power distribution device of the present invention is not limited to the watt hour meter. For example, the present invention can be similarly applied to the sealing structure of other power distribution devices that require sealing such as an earth leakage circuit breaker, a circuit breaker for wiring, and a time switch. The same effect is produced.

DESCRIPTION OF SYMBOLS 11 ... Cover 11a ... Edge 11b, 11e, 11f ... Notch part 11b1, 11b2 ... Side wall of notch part 11b 11d, 11g ... Hole 11e1, 11f1 ... Side wall of notch part 11e, 11f 12 ... Base 12a ... Edge 12b of base 12 ... Wire insertion slot 12c ... Seal screw mounting portion 12d, 12e ... Hole 13 ... Seal screw 14 ... Square seal cap 15 ... Round seal cap 16 ... Wire 17 ... Lead

Claims (2)

In the sealing structure of power distribution equipment that leaves an open trace when the covered cover is opened,
The cover is slid to fit into the base constituting the casing of the power distribution device,
A fitting maintaining structure for sealing the cover while maintaining a state of being fitted to the base ;
The fitting maintaining structure exposes a sealing screw mounting portion for mounting a sealing screw formed on the base, and a sealing screw attached to the sealing screw mounting portion when the cover is slid and fitted to the base. A sealing screw head having a notch shape fitted into the sealing cap and a notch portion formed in the cover, having a side wall that interferes with the fitted sealing cap, and screwed into the sealing screw mounting portion. A sealing structure for a power distribution device, characterized in that a sealing cap that is covered with the notch and interferes with the side wall to prevent the cover from sliding . The fitting maintenance structure, the said a hole provided in the base wall penetrating the lower hole to form a seal screw mounting portion, said hole and position with the cover is fitted to the base coincides seal construction of a distribution device according to claim 1, through string-like body and a hole provided in the cover, characterized in that it is a structure that prevents the sliding of the cover.

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